Unexpected idea

Demonlings. 

Tier 0 Demons.

Demons who had not yet evolved even once after they were born. Unlike Tier-1 Lower Demons, they didn't have Soul Sense, neither did they have Defensive Magic Skins. They were weak, too. In fact, the Hunters compared Demonlings with handguns while they compared Lower Demons with heavy artillery. 

Mark walked into the Dungeon. As expected, it was a science lab, but there was no world-class quality there anymore. The whole place stank of demon shit and sweat. Not to mention, almost all the equipment around seemed to have either been trashed or must have long been taken away.

The funny thing, however, was that the room was incredibly bright. There were too many lights on the ceiling, and they were all on. Yet, the more intriguing part was how every part of the lab was covered with an acidic smell and a green gas.

Indeed, it's full of contaminants.